Cut-grading of small brilliants

In the trade small brilliants up to half a carat (0.47
ct) are usually only visually examined as to their brilliance effect.
This is best seen by diffused light. thus eliminating strong surface
luster and dispersion colors.

The proportions are roughly estimated. external and
symmetry characteristics - as well as inclusions - are observed with a
10 x loupe and influence the total evaluation of cut quality.

The stones are qualitatively graded into

Very good

Excellent brilliance, no or only very few external marks;
discernable with difficulty, no or very few 'symmetry features'
very thin to thin girdle.

Good

Good brilliance, a few externals marks, a few discernable
symmetry marks, thin to medium girdle.